Scroll to see break-even price per barrel for oil in 2015 for select oil producers, and click on a country's name for more details. modest oil-price recovery and currency devaluations have lowered breakeven prices for countries like Russia and Nigeria, but some petrostates still need oil prices above $100 a barrel to balance their budgets.
There are dozens of types of gemstones â including diamonds, colored gemstones, and pearls â each with a unique set of physical and optical properties. GIRDLE â The narrow band around the perimeter of a polished or faceted diamond or colored gemstone.
Beside yellow and pink, lepidolite is a mineral that occurs as lavender, lilac and purple stones. This violet gemstone is transparent to translucent in clarity and glassy in luster. The weakness of this violet crystal lies in its hardness, which is only 2.5 to 3 in the Mohs scale: rather unsuitable for jewelry. Purple Gemstones in Jewelry